US 5,179,868 AGranted

Drive train enable-disable vehicle use device

OwnerRoland Thibeaultinventor

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Abstract

An improved motor vehicle transmission locking device for use with automatic transmissions and manual transmissions. The improved locking device utilizes a solenoid which is used to lock into a notch formed on an existing transmission parking shaft to lock the transmission in the parked position. The solenoid is mounted inside of the transmission case and may be activated by an encoder/decoder circuit and may also be activated by a simple switch or lock switch hidden out of sight on the motor vehicle. A modified form of the invention replaces the existing transmission parking shaft with a split shaft and positions the solenoid between the two pieces of the split shaft. This modification then accomplishes the enabling and disabling of the transmission when activated by either the encoder/decoder circuit or by other switching circuits positioned on, and hidden from a thief that may try to steal the motor vehicle.

Claims6

Dependent claims

In a motor vehicle automatic transmission of the type having a case and having an internal parking gear and the transmission having a parking shaft with a pair of ends, one end being positioned outside of the transmission and connected to a transmission selector lever in the motor vehicle and the other end positioned inside the transmission case and connected to an internal parking pawl operating mechanism, the improvement comprising:

(a) electro-mechanical disabling means, associated with the parking pawl operating mechanism and positioned inside the transmission case, to disable the parking pawl operating mechanism from being able to move the parking pawl once the pawl is locked on the transmission parking gear by the transmission selector lever and to retain the transmission in a parked position, wherein the disabling means comprises, in part, a notch formed in the existing transmission parking shaft and further comprises a solenoid and solenoid plunger, positioned in proximity to the notch in the existing transmission parking shaft to be operable to engage the notch with the solenoid plunger as desired to disable the movement of the parking shaft thereby preventing operation of the transmission selection lever to be able to move;
(b) enabling means, associated with the disabling means and located, in part, outside of the transmission case, to enable the parking pawl operating mechanism to operate as desired so as to be able to disengage the parking pawl from the transmission parking gear, thereby permitting the transmission to be operated as desired;
and
(c) electrical means, associated with the electro-mechanical disabling means and the enabling means and positioned partly inside the transmission case and partly outside of the transmission case to activate the enabling means as desired.

1 more element

(a) electro-mechanical disabling means, associated with the parking pawl operating mechanism and positioned inside the transmission case, to disable the parking pawl operating mechanism from being able to move the parking pawl once the pawl is locked on the transmission parking gear by the transmission selector lever and to retain the transmission in a parked position, wherein the electro-mechanical disabling means comprises, in part, a modified transmission parking shaft to replace the existing transmission parking shaft, the modified parking shaft comprising a disabling mechanism formed with a solenoid and a solenoid plunger interposed between a pair of split shafts having opposite ends, one of the opposite shaft ends being capable of being disabled from the other split shaft end by the operation of the solenoid and the solenoid plunger;
(b) enabling means, associated with the disabling means and located, in part, outside of the transmission case, to enable the parking pawl operating mechanism to operate as desired so as to be able to disengage the parking pawl from the transmission parking gear, thereby permitting the transmission to be operated as desired;
and
(c) electrical means, associated with the electro-mechanical disabling means and the enabling means and positioned partly inside the transmission case and partly outside of the transmission case to activate the enabling means as desired.

1 more element

Dependencies are inferred from the claim text.